I'm not supporting claims of the next 10 release being 64bit, I think it's way too soon and little benefit unless you're playing with a lot of data.
But the claims of a 64bit version of 10 making all other processors out of date are wrong. 10/HFS allows you to combine code for different platforms into a single FAT binary. For example I could give you a FAT version of Photoshop with both PPC and x86 code and the operating system would pick the appropriate segment to...